CAJ | 학술논문

全球气候变化使得新疆植物的生长季变长，对其生理生态产生影响。文章采用 Li－6400XT便携式光合测定系统，测定乌鲁木齐市晚秋榆树的光合作用参数，总结其秋季衰老叶光合特性，揭示榆树的生理特征对气候变化的响应。研究结果表明，其净光合速率日变化呈双峰曲线，15：00出现“午休”现象，净光合速率最高峰出现在13：00，为14μmol· m－2· s－1，次峰出现在17：00，为6umol· m－2· s－1。榆树净光合速率（Pn）与气孔导度（Gs）、蒸腾速率（Tr）、水分利用率（WUE）、大气温度（Ta）以及空气相对湿度（ RH）之间呈正相关，而与胞间二氧化碳浓度（ Ci）呈负相关。秋季延长下，榆树仍具有较高的光合作用，属于“气孔主导型”和“气温主导型”，这有利于西北干旱区的绿洲生态建设和城市绿化植被管理。
전구기후변화사득신강식물적생장계변장，대기생리생태산생영향。문장채용 Li－6400XT편휴식광합측정계통，측정오로목제시만추유수적광합작용삼수，총결기추계쇠로협광합특성，게시유수적생리특정대기후변화적향응。연구결과표명，기정광합속솔일변화정쌍봉곡선，15：00출현“오휴”현상，정광합속솔최고봉출현재13：00，위14μmol· m－2· s－1，차봉출현재17：00，위6umol· m－2· s－1。유수정광합속솔（Pn）여기공도도（Gs）、증등속솔（Tr）、수분이용솔（WUE）、대기온도（Ta）이급공기상대습도（ RH）지간정정상관，이여포간이양화탄농도（ Ci）정부상관。추계연장하，유수잉구유교고적광합작용，속우“기공주도형”화“기온주도형”，저유리우서북간한구적록주생태건설화성시녹화식피관리。
In recent years, a warming trend has been occurring in Xinjiang, it makes the growing season of vegetation longer which has an effect on plant physiological ecology.This article measured the senescing leaves pho-tosynthetic parameters of Ulmus pumila by Li-6400XT, a portable photosynthesis system.It summarized the photo-synthetic characteristics and revealed the response to climate change.This study indicated the diurnal variation be-tween net photosynthetic rate ( Pn) , stomatal conductance ( Gs) transpiration rate( Tr) , the internal CO2 concen-tration( Ci) and efficiency of water application( WUE) .Then it told the curve of diurnal variation of net photosyn-thetic rate (Pn) was dual-peaked with obvious midday depression of the photosynthetic efficiency.The highest Net photosynthetic rate ( Pn) peak appeared at 13:00 and the second peak appeared at 17:00, the value is 14μmolm-2 · s-1 and 6μmol· m-2 · s-1 respectively.There was significant positive correlation between Pn, Gs, Tr, WUE, Ta and RH, while a negative relation between the net photosynthetic rate and intracellular CO2 concentra-tion, belonged to the type of stoma-oriented and temperature-oriented.Under the prolonged autumn, U.pumila still has a strong photosynthesis, which is conducive to an oasis ecological construction and urban green vegetation management in northwest arid area.